| 1 | /* |
| 2 | * Platform abstraction layer |
| 3 | * |
| 4 | * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved |
| 5 | * SPDX-License-Identifier: GPL-2.0 |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * This file is part of mbed TLS (https://tls.mbed.org) |
| 22 | */ |
| 23 | |
| 24 | #if !defined(MBEDTLS_CONFIG_FILE) |
| 25 | #include "mbedtls/config.h" |
| 26 | #else |
| 27 | #include MBEDTLS_CONFIG_FILE |
| 28 | #endif |
| 29 | |
| 30 | #if defined(MBEDTLS_PLATFORM_C) |
| 31 | |
| 32 | #include "mbedtls/platform.h" |
| 33 | #include "mbedtls/platform_util.h" |
| 34 | |
| 35 | #if defined(MBEDTLS_PLATFORM_MEMORY) |
| 36 | #if !defined(MBEDTLS_PLATFORM_STD_CALLOC) |
| 37 | static void *platform_calloc_uninit( size_t n, size_t size ) |
| 38 | { |
| 39 | ((void) n); |
| 40 | ((void) size); |
| 41 | return( NULL ); |
| 42 | } |
| 43 | |
| 44 | #define MBEDTLS_PLATFORM_STD_CALLOC platform_calloc_uninit |
| 45 | #endif /* !MBEDTLS_PLATFORM_STD_CALLOC */ |
| 46 | |
| 47 | #if !defined(MBEDTLS_PLATFORM_STD_FREE) |
| 48 | static void platform_free_uninit( void *ptr ) |
| 49 | { |
| 50 | ((void) ptr); |
| 51 | } |
| 52 | |
| 53 | #define MBEDTLS_PLATFORM_STD_FREE platform_free_uninit |
| 54 | #endif /* !MBEDTLS_PLATFORM_STD_FREE */ |
| 55 | |
| 56 | static void * (*mbedtls_calloc_func)( size_t, size_t ) = MBEDTLS_PLATFORM_STD_CALLOC; |
| 57 | static void (*mbedtls_free_func)( void * ) = MBEDTLS_PLATFORM_STD_FREE; |
| 58 | |
| 59 | void * mbedtls_calloc( size_t nmemb, size_t size ) |
| 60 | { |
| 61 | return (*mbedtls_calloc_func)( nmemb, size ); |
| 62 | } |
| 63 | |
| 64 | void mbedtls_free( void * ptr ) |
| 65 | { |
| 66 | (*mbedtls_free_func)( ptr ); |
| 67 | } |
| 68 | |
| 69 | int mbedtls_platform_set_calloc_free( void * (*calloc_func)( size_t, size_t ), |
| 70 | void (*free_func)( void * ) ) |
| 71 | { |
| 72 | mbedtls_calloc_func = calloc_func; |
| 73 | mbedtls_free_func = free_func; |
| 74 | return( 0 ); |
| 75 | } |
| 76 | #endif /* MBEDTLS_PLATFORM_MEMORY */ |
| 77 | |
| 78 | #if defined(_WIN32) |
| 79 | #include <stdarg.h> |
| 80 | int mbedtls_platform_win32_snprintf( char *s, size_t n, const char *fmt, ... ) |
| 81 | { |
| 82 | int ret; |
| 83 | va_list argp; |
| 84 | |
| 85 | /* Avoid calling the invalid parameter handler by checking ourselves */ |
| 86 | if( s == NULL || n == 0 || fmt == NULL ) |
| 87 | return( -1 ); |
| 88 | |
| 89 | va_start( argp, fmt ); |
| 90 | #if defined(_TRUNCATE) && !defined(__MINGW32__) |
| 91 | ret = _vsnprintf_s( s, n, _TRUNCATE, fmt, argp ); |
| 92 | #else |
| 93 | ret = _vsnprintf( s, n, fmt, argp ); |
| 94 | if( ret < 0 || (size_t) ret == n ) |
| 95 | { |
| 96 | s[n-1] = '\0'; |
| 97 | ret = -1; |
| 98 | } |
| 99 | #endif |
| 100 | va_end( argp ); |
| 101 | |
| 102 | return( ret ); |
| 103 | } |
| 104 | #endif |
| 105 | |
| 106 | #if defined(MBEDTLS_PLATFORM_SNPRINTF_ALT) |
| 107 | #if !defined(MBEDTLS_PLATFORM_STD_SNPRINTF) |
| 108 | /* |
| 109 | * Make dummy function to prevent NULL pointer dereferences |
| 110 | */ |
| 111 | static int platform_snprintf_uninit( char * s, size_t n, |
| 112 | const char * format, ... ) |
| 113 | { |
| 114 | ((void) s); |
| 115 | ((void) n); |
| 116 | ((void) format); |
| 117 | return( 0 ); |
| 118 | } |
| 119 | |
| 120 | #define MBEDTLS_PLATFORM_STD_SNPRINTF platform_snprintf_uninit |
| 121 | #endif /* !MBEDTLS_PLATFORM_STD_SNPRINTF */ |
| 122 | |
| 123 | int (*mbedtls_snprintf)( char * s, size_t n, |
| 124 | const char * format, |
| 125 | ... ) = MBEDTLS_PLATFORM_STD_SNPRINTF; |
| 126 | |
| 127 | int mbedtls_platform_set_snprintf( int (*snprintf_func)( char * s, size_t n, |
| 128 | const char * format, |
| 129 | ... ) ) |
| 130 | { |
| 131 | mbedtls_snprintf = snprintf_func; |
| 132 | return( 0 ); |
| 133 | } |
| 134 | #endif /* MBEDTLS_PLATFORM_SNPRINTF_ALT */ |
| 135 | |
| 136 | #if defined(MBEDTLS_PLATFORM_PRINTF_ALT) |
| 137 | #if !defined(MBEDTLS_PLATFORM_STD_PRINTF) |
| 138 | /* |
| 139 | * Make dummy function to prevent NULL pointer dereferences |
| 140 | */ |
| 141 | static int platform_printf_uninit( const char *format, ... ) |
| 142 | { |
| 143 | ((void) format); |
| 144 | return( 0 ); |
| 145 | } |
| 146 | |
| 147 | #define MBEDTLS_PLATFORM_STD_PRINTF platform_printf_uninit |
| 148 | #endif /* !MBEDTLS_PLATFORM_STD_PRINTF */ |
| 149 | |
| 150 | int (*mbedtls_printf)( const char *, ... ) = MBEDTLS_PLATFORM_STD_PRINTF; |
| 151 | |
| 152 | int mbedtls_platform_set_printf( int (*printf_func)( const char *, ... ) ) |
| 153 | { |
| 154 | mbedtls_printf = printf_func; |
| 155 | return( 0 ); |
| 156 | } |
| 157 | #endif /* MBEDTLS_PLATFORM_PRINTF_ALT */ |
| 158 | |
| 159 | #if defined(MBEDTLS_PLATFORM_FPRINTF_ALT) |
| 160 | #if !defined(MBEDTLS_PLATFORM_STD_FPRINTF) |
| 161 | /* |
| 162 | * Make dummy function to prevent NULL pointer dereferences |
| 163 | */ |
| 164 | static int platform_fprintf_uninit( FILE *stream, const char *format, ... ) |
| 165 | { |
| 166 | ((void) stream); |
| 167 | ((void) format); |
| 168 | return( 0 ); |
| 169 | } |
| 170 | |
| 171 | #define MBEDTLS_PLATFORM_STD_FPRINTF platform_fprintf_uninit |
| 172 | #endif /* !MBEDTLS_PLATFORM_STD_FPRINTF */ |
| 173 | |
| 174 | int (*mbedtls_fprintf)( FILE *, const char *, ... ) = |
| 175 | MBEDTLS_PLATFORM_STD_FPRINTF; |
| 176 | |
| 177 | int mbedtls_platform_set_fprintf( int (*fprintf_func)( FILE *, const char *, ... ) ) |
| 178 | { |
| 179 | mbedtls_fprintf = fprintf_func; |
| 180 | return( 0 ); |
| 181 | } |
| 182 | #endif /* MBEDTLS_PLATFORM_FPRINTF_ALT */ |
| 183 | |
| 184 | #if defined(MBEDTLS_PLATFORM_EXIT_ALT) |
| 185 | #if !defined(MBEDTLS_PLATFORM_STD_EXIT) |
| 186 | /* |
| 187 | * Make dummy function to prevent NULL pointer dereferences |
| 188 | */ |
| 189 | static void platform_exit_uninit( int status ) |
| 190 | { |
| 191 | ((void) status); |
| 192 | } |
| 193 | |
| 194 | #define MBEDTLS_PLATFORM_STD_EXIT platform_exit_uninit |
| 195 | #endif /* !MBEDTLS_PLATFORM_STD_EXIT */ |
| 196 | |
| 197 | void (*mbedtls_exit)( int status ) = MBEDTLS_PLATFORM_STD_EXIT; |
| 198 | |
| 199 | int mbedtls_platform_set_exit( void (*exit_func)( int status ) ) |
| 200 | { |
| 201 | mbedtls_exit = exit_func; |
| 202 | return( 0 ); |
| 203 | } |
| 204 | #endif /* MBEDTLS_PLATFORM_EXIT_ALT */ |
| 205 | |
| 206 | #if defined(MBEDTLS_HAVE_TIME) |
| 207 | |
| 208 | #if defined(MBEDTLS_PLATFORM_TIME_ALT) |
| 209 | #if !defined(MBEDTLS_PLATFORM_STD_TIME) |
| 210 | /* |
| 211 | * Make dummy function to prevent NULL pointer dereferences |
| 212 | */ |
| 213 | static mbedtls_time_t platform_time_uninit( mbedtls_time_t* timer ) |
| 214 | { |
| 215 | ((void) timer); |
| 216 | return( 0 ); |
| 217 | } |
| 218 | |
| 219 | #define MBEDTLS_PLATFORM_STD_TIME platform_time_uninit |
| 220 | #endif /* !MBEDTLS_PLATFORM_STD_TIME */ |
| 221 | |
| 222 | mbedtls_time_t (*mbedtls_time)( mbedtls_time_t* timer ) = MBEDTLS_PLATFORM_STD_TIME; |
| 223 | |
| 224 | int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t* timer ) ) |
| 225 | { |
| 226 | mbedtls_time = time_func; |
| 227 | return( 0 ); |
| 228 | } |
| 229 | #endif /* MBEDTLS_PLATFORM_TIME_ALT */ |
| 230 | |
| 231 | #endif /* MBEDTLS_HAVE_TIME */ |
| 232 | |
| 233 | #if defined(MBEDTLS_ENTROPY_NV_SEED) |
| 234 | #if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO) |
| 235 | /* Default implementations for the platform independent seed functions use |
| 236 | * standard libc file functions to read from and write to a pre-defined filename |
| 237 | */ |
| 238 | int mbedtls_platform_std_nv_seed_read( unsigned char *buf, size_t buf_len ) |
| 239 | { |
| 240 | FILE *file; |
| 241 | size_t n; |
| 242 | |
| 243 | if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "rb" ) ) == NULL ) |
| 244 | return( -1 ); |
| 245 | |
| 246 | if( ( n = fread( buf, 1, buf_len, file ) ) != buf_len ) |
| 247 | { |
| 248 | fclose( file ); |
| 249 | mbedtls_platform_zeroize( buf, buf_len ); |
| 250 | return( -1 ); |
| 251 | } |
| 252 | |
| 253 | fclose( file ); |
| 254 | return( (int)n ); |
| 255 | } |
| 256 | |
| 257 | int mbedtls_platform_std_nv_seed_write( unsigned char *buf, size_t buf_len ) |
| 258 | { |
| 259 | FILE *file; |
| 260 | size_t n; |
| 261 | |
| 262 | if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "w" ) ) == NULL ) |
| 263 | return -1; |
| 264 | |
| 265 | if( ( n = fwrite( buf, 1, buf_len, file ) ) != buf_len ) |
| 266 | { |
| 267 | fclose( file ); |
| 268 | return -1; |
| 269 | } |
| 270 | |
| 271 | fclose( file ); |
| 272 | return( (int)n ); |
| 273 | } |
| 274 | #endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */ |
| 275 | |
| 276 | #if defined(MBEDTLS_PLATFORM_NV_SEED_ALT) |
| 277 | #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ) |
| 278 | /* |
| 279 | * Make dummy function to prevent NULL pointer dereferences |
| 280 | */ |
| 281 | static int platform_nv_seed_read_uninit( unsigned char *buf, size_t buf_len ) |
| 282 | { |
| 283 | ((void) buf); |
| 284 | ((void) buf_len); |
| 285 | return( -1 ); |
| 286 | } |
| 287 | |
| 288 | #define MBEDTLS_PLATFORM_STD_NV_SEED_READ platform_nv_seed_read_uninit |
| 289 | #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_READ */ |
| 290 | |
| 291 | #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE) |
| 292 | /* |
| 293 | * Make dummy function to prevent NULL pointer dereferences |
| 294 | */ |
| 295 | static int platform_nv_seed_write_uninit( unsigned char *buf, size_t buf_len ) |
| 296 | { |
| 297 | ((void) buf); |
| 298 | ((void) buf_len); |
| 299 | return( -1 ); |
| 300 | } |
| 301 | |
| 302 | #define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE platform_nv_seed_write_uninit |
| 303 | #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_WRITE */ |
| 304 | |
| 305 | int (*mbedtls_nv_seed_read)( unsigned char *buf, size_t buf_len ) = |
| 306 | MBEDTLS_PLATFORM_STD_NV_SEED_READ; |
| 307 | int (*mbedtls_nv_seed_write)( unsigned char *buf, size_t buf_len ) = |
| 308 | MBEDTLS_PLATFORM_STD_NV_SEED_WRITE; |
| 309 | |
| 310 | int mbedtls_platform_set_nv_seed( |
| 311 | int (*nv_seed_read_func)( unsigned char *buf, size_t buf_len ), |
| 312 | int (*nv_seed_write_func)( unsigned char *buf, size_t buf_len ) ) |
| 313 | { |
| 314 | mbedtls_nv_seed_read = nv_seed_read_func; |
| 315 | mbedtls_nv_seed_write = nv_seed_write_func; |
| 316 | return( 0 ); |
| 317 | } |
| 318 | #endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */ |
| 319 | #endif /* MBEDTLS_ENTROPY_NV_SEED */ |
| 320 | |
| 321 | #if !defined(MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT) |
| 322 | /* |
| 323 | * Placeholder platform setup that does nothing by default |
| 324 | */ |
| 325 | int mbedtls_platform_setup( mbedtls_platform_context *ctx ) |
| 326 | { |
| 327 | (void)ctx; |
| 328 | |
| 329 | return( 0 ); |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * Placeholder platform teardown that does nothing by default |
| 334 | */ |
| 335 | void mbedtls_platform_teardown( mbedtls_platform_context *ctx ) |
| 336 | { |
| 337 | (void)ctx; |
| 338 | } |
| 339 | #endif /* MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT */ |
| 340 | |
| 341 | #endif /* MBEDTLS_PLATFORM_C */ |